Scientific Investigations Report 2006–5290

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5290

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Figure - refer to figure caption for alternative text description

Figure 11. Percentage of major aquifer study (MAS) and source-water quality assessment (SWQA) wells sampled by class of water use in 22 study units of the National Water-Quality Assessment program, 1993-2004.

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